Answer:
Step-by-step explanation:
a) -3x = -21
Divide both sides by (-3)
-3x/-3 = -21/-3
x = 7
b) -7x + 16 = 2x - 20
Subtract 16 from both sides
-7x + 16 -16 = 2x - 20 -16
-7x = 2x - 36
Subtract 2x from both sides
-7x -2x = 2x - 36 - 2x
-9x = -36
Divide both sides by (-9)
-9x/-9 = -36/-9
x = 4
